Damper for a ventilation turbine



FIG. 1 is a top plan view of a damper for a ventilation turbine showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof, with both side views being identical;

FIG. 4 is a cross-sectional view thereof, taken in the plane represented by lines 4--4 in FIG. 1;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a damper for a ventilation turbine, as shown and described. 